US4210215A - Rock drill with helical dust conveying groove - Google Patents

Rock drill with helical dust conveying groove Download PDF

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Publication number
US4210215A
US4210215A US05/929,268 US92926878A US4210215A US 4210215 A US4210215 A US 4210215A US 92926878 A US92926878 A US 92926878A US 4210215 A US4210215 A US 4210215A
Authority
US
United States
Prior art keywords
drill
drilling dust
drilling
core
conveying groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/929,268
Other languages
English (en)
Inventor
Wolfgang Peetz
Siefgried Klaissle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hawera Probst GmbH filed Critical Hawera Probst GmbH
Application granted granted Critical
Publication of US4210215A publication Critical patent/US4210215A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the present invention relates to a rock drill, especially for rotary blow machines and drifters or stopers with drilling cutting edges and with at least one groove for the drilling dust.
  • This groove is confined in axial direction by a helical web extending around the axis of the drill while one side surface of the web forms a supporting surface for the drilling dust, the supporting surface merging with the bottom of the groove for the drilling dust.
  • the groove bottom extends nearly over the entire width of the groove parallel to the axis of the drill so that a groove for the drilling dust is formed which in axial section has an approximately rectangular cross section.
  • the bottom of this groove merges with the web of the approximately rectangular cross section, which web confines the groove for the drilling dust in axial direction of the drill.
  • the web wears relatively quickly during use of the drill.
  • the depth of the groove for the drilling dust decreases so that prematurely a poor movement of the drilling dust in the groove will take place.
  • the drilling dust will in such an instance no longer be removed to a sufficient extent from the hole to be drilled and an accumulation of drilling dust occurs in the groove whereby the drilling progress is slowed down.
  • the drilling machine may even come to a standstill.
  • the decreasing drilling process also subjects the drill to an undue load so that the drill might even break.
  • FIG. 1 is a side view of a rock drill according to the invention.
  • FIG. 2 shows the rock drill of FIG. 1 in which only a portion of the drilling grooves is shown.
  • FIG. 3 represents a section taken along the line III--III of FIG. 1.
  • FIG. 4 shows on an enlarged scale a cutout of FIG. 3.
  • the rock drill according to the present invention is characterized primarily in that the bottom of the groove for the drilling dust extends rectilinearly from the supporting surface of the drilling dust at an acute angle with regard to the drilling axis of the drill to the back surface of the web, and is furthermore characterized in that the ratio of the width of this groove, when measured in axial direction of the drill, to the width of the back of the web is greater than 5:1.
  • an asymmetrical design of the groove is obtained which has its maximum depth in the region of the supporting surface for the drilling dust, while this depth is steadily decreasing in the direction toward the web.
  • the drilling dust has a sufficiently large space available so that it can quickly be transported out of the hole being drilled.
  • the width of the web is, in view of the design according to the present invention, rather small in comparison to the width of the groove, whereby only a slight friction is encountered at the wall of the hole being drilled and consequently a fast drilling process is assured.
  • the cross-sectional surface of the web steadily increases in the direction toward the axis of the drill in view of the inclined and rectilinearly extending groove bottom.
  • the cross section of the back surface increases, whereby a considerable reduction in wear will be realized.
  • the removal of material from the web per time unit continuously decreases so that only a slight decrease in the drilling dust supporting surface occurs which does not affect the fast removal of the drilling dust.
  • the supporting surface for the drilling dust remains sufficiently large to assure a fast transport of the drilling dust and thus a fast drilling progress.
  • the rock drill according to the invention is, in view of its low wall friction, the good transport of the drilling dust, and the fast drilling progress very favorable for use in connection with small and low-power drilling machines.
  • the rock drill shown therein is particularly well suited for rotary blow drilling and comprises a drilling cutting blade 1 which is preferably formed by a soldered-in hard metal plate.
  • the blade 1 comprises two blade sections 1a and 1b arranged in a roof-like manner with regard to each other.
  • Each of the blade sections 1a and 1b has associated therewith a drilling dust groove 2 and 3 respectively.
  • the grooves 2 and 3 extend helically about the axis 4 of the drill and in axial direction are confined by webs 5 and 6 extending helically around the axis of the drill.
  • the web end In the region of the tip of the drill, the web end is rectilinear, whereby a good support of the hard metal plate at both sides and large soldering surfaces for a safe connection of the hard metal plate to the drill body are obtained.
  • the grooves 2 and 3 merge with a cylindrical section 7 of the drill which is adjacent the chucking end 8.
  • the rock drill according to the invention preferably has a diameter of from 5 to 20 mm and is intended for deep drilling.
  • the ratio of the drill length L to the rated diameter D amounts to about 20:1.
  • the rated diameter D is determined by the width of the hard metal plate 1.
  • the length L of the drill corresponds to the distance between the drill tip 9 and the free end of the chucking end 8 (FIG. 2).
  • the angle of inclination ⁇ of the two grooves 2 and 3 advantageously amounts to not more than 40°. In view of this relatively small inclination of the grooves 2 and 3, the transport of the drilling dust is improved.
  • the grooves 2, 3 have an asymmetrical cross section.
  • the bottom 10 of the grooves 2, 3, when seen in axial section, is rectilinear over its entire length, and with the axis 4 of the drill forms an angle ⁇ of approximately 15°. That end of the groove bottom 10 which faces the chucking end 8 joins the back surface 11 of the web 5, 6 at an angle.
  • the angle ⁇ between the groove bottom 10 and the back surface 11 amounts to about 15° (FIG. 3).
  • That end of the groove bottom 10 which faces toward the drill tip 9 merges along an arc with the supporting surface 12 for the drilling dust.
  • the supporting surface 12 is undercut by an angle ⁇ of about 5° to 10°.
  • the supporting surface for the drilling dust will in the region of the back surface of web 5, 6 define with the axis 4 of the drill an acute angle which opens in the direction toward the chucking end 8.
  • the drilling dust on the supporting surface will, in view of the undercut, during the drilling operation, in view of axial shocks be moved in the direction toward the groove bottom 10, in other words, into the collecting chamber 13 of the grooves 2, 3.
  • the drilling dust will therefore during the drilling operation remain in the grooves 2, 3 and will be quickly transported out of the hole being drilled.
  • this supporting surface 12 is nearly over its entire length located on a circular arc having a radius r which amounts to about from 0.7 to 0.8 times the distance t between the drill core 14 and the enveloping surface 15 for the drill (FIG. 2).
  • the drill has, in addition to a large collecting chamber 13, also a sufficient thickness so that the drill will in this area have a sufficient resistance against buckling.
  • the wedge angle ⁇ between the supporting surface 12 for the drilling dust and the bottom 10 of the groove following in the direction toward the drill tip amounts to from 70° to 80°.
  • the depth of the groove steadily decreases from the drilling dust supporting surface 12 in the direction toward the chucking end 8.
  • the cross-sectional surface of the webs 5, 6 increases in the direction toward the axis 4 of the drill.
  • the width F o of the back quickly increases via F 1 and F 2 to F 3 over a small radial length.
  • the wear per time unit is greatly reduced with increasing time of use.
  • the ratio of the groove width N for the drilling dust to the width F of the back is advantageously selected greater than 5:1.
  • the webs 5, 6 have only a slight width whereby the friction on the wall of the hole being drilled is reduced and the size of the grooves 2, 3 for the drilling dust is increased.
  • the reduced width of the web and the thus obtained increase in the grooves 2, 3 increase the useful life of the drill and improve the drilling progress.
  • the width F of the back amounts to about from 1/5 to 1/10 of the rated diameter D of the drill.
  • the width of the back of the webs is small also with large rated diameter, and the grooves 2, 3 for the drilling dust are correspondingly large so that the drilling dust obtained with large drills can be properly removed from the hole being drilled to a greater extent.
  • the drill core 14 is nearly over the entire length of the grooves 2, 3 cylindrical (FIG. 2) in which connection the cylinder axis is formed by the axis 4 of the drill.
  • the drill core 14 is formed by that section of the drill which is surrounded by the grooves 2, 3.
  • the diameter d of the drill core 14 is not larger than half the rated diameter D so that the drill will have a high resistance against buckling.
  • the drill core 14 widens in the direction of the drill shank 8.
  • this widening of the drill core 14, when seen in axial section, is not linear but parabolic or hyperbolic. As a result thereof, the course of the grain of the drill is only slightly disturbed in this region.
  • the increase of the core cross section is effected over an axial length 16 of not more than 30% of the entire axial length of the web 5, 6.
  • the drill core 14 when seen in axial direction, widens circularly with a radius R amounting to at least 100 mm. Due to this high increase in the thickness of the core over a short length of the drill in the region of the outer end of the grooves 2, 3 directly below the cylindrical drill section 7, the drill is able safely to absorb high alternating bending stresses occurring during operation which may be encountered, for instance, by a nonprecise guiding of the drilling machine at nearly completed drilling depth. The high alternating bending stresses must then be absorbed over a relatively short free bending length. This is accomplished by the great increase in the thickness of the core.
  • the rock drill due to its slender design, has a relatively large space for the transport of the drilling dust whereby the drilling speed is favored.
  • the asymmetrical design of the grooves 2, 3 results in a reduction of the wall friction while simultaneously a sufficiently large space is available for the transport of the drilling dust.
  • the drill core 14 has a constant diameter d nearly over the entire length of the grooves for the drilling dust, the depth of the grooves 2, 3 is not changed over the length of the drill so that over the entire length of the drill a proper transport of the drilling dust can occur.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
US05/929,268 1977-08-04 1978-07-31 Rock drill with helical dust conveying groove Expired - Lifetime US4210215A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2735227 1977-08-04
DE2735227A DE2735227C2 (de) 1977-08-04 1977-08-04 Gesteinsbohrer

Publications (1)

Publication Number Publication Date
US4210215A true US4210215A (en) 1980-07-01

Family

ID=6015646

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/929,268 Expired - Lifetime US4210215A (en) 1977-08-04 1978-07-31 Rock drill with helical dust conveying groove

Country Status (10)

Country Link
US (1) US4210215A (fr)
JP (1) JPS5428203A (fr)
BR (1) BR7804996A (fr)
CH (1) CH629987A5 (fr)
DE (1) DE2735227C2 (fr)
DK (1) DK338278A (fr)
FR (1) FR2399537A1 (fr)
GB (1) GB2001878B (fr)
MX (1) MX146619A (fr)
NL (1) NL7808189A (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4967855A (en) * 1988-10-12 1990-11-06 Hawera Probst Gmbh & Co. Drilling tool
US5035552A (en) * 1988-09-29 1991-07-30 Lysenko Viktor G Twist drill for deep hole drilling
US5040620A (en) * 1990-10-11 1991-08-20 Nunley Dwight S Methods and apparatus for drilling subterranean wells
US5265688A (en) * 1990-04-09 1993-11-30 Hilti Aktiengesellschaft Rock drill
US5382121A (en) * 1993-09-02 1995-01-17 Bicknell; David P. Drill bit for use in concrete and asphalt
US5487434A (en) * 1993-11-12 1996-01-30 Hilti Aktiengesellschaft Rock drill with conveying groove
US5641028A (en) * 1995-08-10 1997-06-24 Black & Decker Inc. Drill bit with debris conveying flute
USD408424S (en) * 1998-03-23 1999-04-20 Schmotzer Norman H Wood drill
US5918105A (en) * 1994-12-12 1999-06-29 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
USD419575S (en) * 1999-01-07 2000-01-25 Kouvato, Inc. Drill bit
US6056073A (en) * 1997-03-17 2000-05-02 S.M.F. International Element of a rotating drill pipe string
USD430584S (en) * 1999-12-07 2000-09-05 Kouvato, Inc. Drill bit
US6174111B1 (en) 1994-12-12 2001-01-16 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
CN1075405C (zh) * 1995-06-17 2001-11-28 希尔蒂股份公司 制造旋钻工具的方法
US6457916B2 (en) 1999-11-15 2002-10-01 Insty-Bit, Inc. Locking quick-change chuck assembly
US6561523B1 (en) 1999-11-18 2003-05-13 James L. Wienhold Automatic tool-bit holder
US6588994B2 (en) 2000-05-17 2003-07-08 James L. Wienhold Drill bit tail
EP1475510A1 (fr) * 2003-05-09 2004-11-10 Robert Bosch Gmbh Foret
US20100135741A1 (en) * 2008-12-03 2010-06-03 Black & Decker Inc. Drill Bit Including One Piece Cutting Head
USD734792S1 (en) * 2013-03-15 2015-07-21 Black & Decker Inc. Drill bit
US9085074B2 (en) 2011-03-22 2015-07-21 Black & Decker Inc. Chisels
USD737875S1 (en) * 2013-03-15 2015-09-01 Black & Decker Inc. Drill bit
US9333564B2 (en) 2013-03-15 2016-05-10 Black & Decker Inc. Drill bit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK152555C (da) * 1985-04-01 1988-08-01 Joran Bor A S Stenbor, isaer til hammerboremaskiner
DE3526162A1 (de) * 1985-07-22 1987-01-22 Black & Decker Inc Bohrhammer sowie bohrhammerwerkzeug
US5046902A (en) * 1988-10-21 1991-09-10 Zubov Alexei V Spiral drill
DE19650487A1 (de) * 1996-12-05 1998-06-10 Hilti Ag Bohrwerkzeug

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US335469A (en) * 1886-02-02 Eugene moeeau
US2045725A (en) * 1935-04-29 1936-06-30 Richardson Dean Royden Rock and coal auger
US2084737A (en) * 1935-07-05 1937-06-22 William J Neumann Reamer
US2859645A (en) * 1957-04-05 1958-11-11 Cleveland Twist Drill Co Drilling bit for construction work
NL6603310A (fr) * 1965-03-13 1966-09-14
US3469643A (en) * 1966-06-08 1969-09-30 Netherlands Tool Mfg Co Drill,particularly for rotary percussion drilling
DE2159728A1 (de) * 1971-12-02 1973-06-07 Heller Geb Hammerbohrer
US3749189A (en) * 1970-12-02 1973-07-31 Werkzeugbau Gmbh Rock drilling bit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1927754C3 (de) * 1969-05-30 1978-12-14 Hawera Probst Gmbh + Co, 7980 Ravensburg Gesteinsbohrer
DE7043488U (de) * 1970-11-25 1971-04-15 Reitholdt H As Gesteinsbohrer fuer schlagbohrmaschinen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US335469A (en) * 1886-02-02 Eugene moeeau
US2045725A (en) * 1935-04-29 1936-06-30 Richardson Dean Royden Rock and coal auger
US2084737A (en) * 1935-07-05 1937-06-22 William J Neumann Reamer
US2859645A (en) * 1957-04-05 1958-11-11 Cleveland Twist Drill Co Drilling bit for construction work
NL6603310A (fr) * 1965-03-13 1966-09-14
US3469643A (en) * 1966-06-08 1969-09-30 Netherlands Tool Mfg Co Drill,particularly for rotary percussion drilling
US3749189A (en) * 1970-12-02 1973-07-31 Werkzeugbau Gmbh Rock drilling bit
DE2159728A1 (de) * 1971-12-02 1973-06-07 Heller Geb Hammerbohrer

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035552A (en) * 1988-09-29 1991-07-30 Lysenko Viktor G Twist drill for deep hole drilling
US4967855A (en) * 1988-10-12 1990-11-06 Hawera Probst Gmbh & Co. Drilling tool
US5265688A (en) * 1990-04-09 1993-11-30 Hilti Aktiengesellschaft Rock drill
US5040620A (en) * 1990-10-11 1991-08-20 Nunley Dwight S Methods and apparatus for drilling subterranean wells
US5382121A (en) * 1993-09-02 1995-01-17 Bicknell; David P. Drill bit for use in concrete and asphalt
US5487434A (en) * 1993-11-12 1996-01-30 Hilti Aktiengesellschaft Rock drill with conveying groove
US6174111B1 (en) 1994-12-12 2001-01-16 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
US5918105A (en) * 1994-12-12 1999-06-29 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
CN1075405C (zh) * 1995-06-17 2001-11-28 希尔蒂股份公司 制造旋钻工具的方法
US5641028A (en) * 1995-08-10 1997-06-24 Black & Decker Inc. Drill bit with debris conveying flute
US6056073A (en) * 1997-03-17 2000-05-02 S.M.F. International Element of a rotating drill pipe string
USD408424S (en) * 1998-03-23 1999-04-20 Schmotzer Norman H Wood drill
USD419575S (en) * 1999-01-07 2000-01-25 Kouvato, Inc. Drill bit
US6457916B2 (en) 1999-11-15 2002-10-01 Insty-Bit, Inc. Locking quick-change chuck assembly
US6561523B1 (en) 1999-11-18 2003-05-13 James L. Wienhold Automatic tool-bit holder
USD430584S (en) * 1999-12-07 2000-09-05 Kouvato, Inc. Drill bit
US6588994B2 (en) 2000-05-17 2003-07-08 James L. Wienhold Drill bit tail
EP1475510A1 (fr) * 2003-05-09 2004-11-10 Robert Bosch Gmbh Foret
US20100135741A1 (en) * 2008-12-03 2010-06-03 Black & Decker Inc. Drill Bit Including One Piece Cutting Head
US7861807B2 (en) 2008-12-03 2011-01-04 Black & Decker Inc. Drill bit including one piece cutting head
US9085074B2 (en) 2011-03-22 2015-07-21 Black & Decker Inc. Chisels
US9333635B2 (en) 2011-03-22 2016-05-10 Black & Decker Inc. Chisels
USD734792S1 (en) * 2013-03-15 2015-07-21 Black & Decker Inc. Drill bit
USD737875S1 (en) * 2013-03-15 2015-09-01 Black & Decker Inc. Drill bit
US9333564B2 (en) 2013-03-15 2016-05-10 Black & Decker Inc. Drill bit

Also Published As

Publication number Publication date
NL7808189A (nl) 1979-02-06
DE2735227C2 (de) 1983-10-27
JPS5428203A (en) 1979-03-02
GB2001878B (en) 1982-06-30
FR2399537B1 (fr) 1983-10-21
GB2001878A (en) 1979-02-14
BR7804996A (pt) 1979-05-22
DE2735227A1 (de) 1979-02-15
DK338278A (da) 1979-02-05
MX146619A (es) 1982-07-15
CH629987A5 (de) 1982-05-28
FR2399537A1 (fr) 1979-03-02

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